The correct answer is C. 15 kmph.
A facing point is a railway point that is set to allow trains to move in only one direction. It is typically used at the entrance to a station or yard. The maximum speed over a facing point in a non-interlocked station is 15 kmph. This is to ensure the safety of passengers and train staff.
Option A is incorrect because the maximum speed over a facing point in a non-interlocked station is 15 kmph, not 50 kmph.
Option B is incorrect because the maximum speed over a facing point in a non-interlocked station is 15 kmph, not 75 kmph.
Option D is incorrect because the maximum speed over a facing point in a non-interlocked station is 15 kmph, not 25 kmph.